JP2006157818A - Digital-broadcasting receiver, digital-broadcasting receiving program and method for receiving digital broadcasting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital-broadcasting receiver preparing a channel list indicating channels capable of being received in an on-the-spot region in a short time, a digital-broadcasting receiving program and a method for receiving digital broadcasting. <P>SOLUTION: The digital-broadcasting receiver preferentially prepares a first stage channel list tabulating only the physical channels capable of being selected by a user when the channel list is prepared (S51 to S53). The digital-broadcasting receiver carries out the registration of proper informations contained in PSI/SI obtained by multiple separation processing in response to channel-selecting operations to the physical channels in this case (S55 to S57). A time when the channels capable of being received are indicated to the user and can be selected can be shortened largely by dividing the preparation of the channel list into two stages and preparing the channel list in this manner. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital broadcast receiving apparatus, a digital broadcast receiving program, and a digital broadcast receiving method. More specifically, the present invention relates to a digital broadcast mounted on a mobile body such as a portable or a vehicle that can be moved while viewing the digital broadcast. The present invention relates to a reception device, a digital broadcast reception program executed by the digital broadcast reception device, and a digital broadcast reception method.

  Conventionally, a digital broadcast receiving apparatus that receives local prefectural broadcasts that are closely related to a local area is a master station that transmits a broadcast signal transmitted by a broadcast station at a predetermined frequency, or a relay that amplifies and retransmits a radio wave received from the parent station. The broadcast wave from the station is received by the antenna, and the received broadcast wave is demodulated / demultiplexed / decoded to present the content transmitted by the broadcast station to the user. Therefore, the user needs to know in advance the frequency (hereinafter referred to as a channel) assigned to the broadcast station that the user wants to view. In addition, when a user intends to view a plurality of channels in a viewing area, the user needs to grasp a plurality of channels (hereinafter referred to as channel groups) that can be received in the area. In general, information (hereinafter, referred to as a channel list) that combines the above-mentioned channel group of each region and the broadcast station name of each channel is stored in advance in a nonvolatile memory of the digital broadcast receiving apparatus, and the channel list The user selects one channel and receives a desired broadcast station, thereby simplifying the user's operation (see, for example, Patent Document 1).

  In a stationary digital broadcast receiver that is installed in a home for viewing, a new channel list will be displayed if a new digital broadcast receiver is installed or moved to another area. Setting is required. Specifically, the digital broadcast receiving apparatus scans digital broadcast channels in order, and receives specific information from PSI / SI (Program Specific Information / Service Information) included in the digital data of the channels from which the digital broadcast can be received. Acquire and create a channel list. Here, in the case of a stationary digital broadcast receiving apparatus, since the channel list is set as the initial setting in the above case, the number of times of setting the channel list is extremely small.

  On the other hand, in a digital broadcast receiving apparatus mounted on a mobile body such as a portable type or a vehicle that can be moved while viewing a digital broadcast, movement frequently occurs. Here, since the channel used by the broadcast station may differ from region to region, if the reception region changes by moving the digital broadcast receiver, the channel list set in the reception region before moving will be the reception region after moving An unusable event occurs. In this case, the digital broadcast receiving apparatus recreates a channel list in the destination area.

There has also been a proposal for easily performing channel scanning when the reception area changes (see, for example, Patent Document 2). In the mobile terminal device disclosed in Patent Document 2, the current position where the mobile terminal device is located is specified by a GPS or a mobile phone base station (when the mobile terminal device is configured by mounting a TV reception function on the mobile phone). To do. And the said portable terminal device selects and uses the channel list regarding the area containing the said present position from the several channel list for every area (for example, for every receiving area) memorize | stored beforehand.
JP 2001-197389 A JP 2003-309774 A

  However, in creating the channel list of the digital broadcast receiving apparatus, the channel list is created by acquiring unique information from the PSI / SI included in the digital data of the channels that can be received by broadcasting by scanning all the channels in order. . Therefore, it takes a long time to create a channel list and present a receivable channel based on the channel list to the user so that the channel can be selected and viewed.

  On the other hand, the portable terminal device disclosed in Patent Document 2 requires a memory for storing a channel list for every region that may move, and there are many limitations on the available storage capacity. However, it is difficult to realize the digital broadcast receiving apparatus. In addition, even in an area where a channel list is prepared, there are channels that cannot be received according to the reception environment in the digital broadcast receiving apparatus. In this case, the channel list is not a list of receivable channels.

  Therefore, an object of the present invention is to provide a digital broadcast receiving apparatus, a digital broadcast receiving program, and a digital broadcast receiving method that create a channel list indicating channels that can be received in the current region in a short time.

In order to achieve the above object, the present invention has the following features.
A first invention is a digital broadcast receiving apparatus that receives digital broadcast of a channel selected from a channel list. The channel list is set as a list of receivable channel candidates. The digital broadcast receiving apparatus includes a receiving unit, a demodulating unit, a demultiplexing unit, a channel selection control unit, and a channel list storage unit. The receiving unit receives a multiplexed signal having a frequency corresponding to the channel. The demodulator demodulates the multiplexed signal received by the receiver into a transport stream. The demultiplexing unit separates and extracts unique information included in the transport stream demodulated by the demodulation unit. The channel selection control unit designates a channel received by the receiving unit, and registers the receivable channel in the channel list when the signal of the channel can be received by the receiving unit. The channel list storage unit stores a channel list. The channel selection control unit demultiplexes the channel list created from a list of only receivable channels, or the transport stream obtained by demodulating the multiplexed signal of that channel for some channels registered in the channel list. Channel selection is performed based on the channel list in which the unique information extracted by the section is registered.

  In a second aspect based on the first aspect, the channel selection control unit creates a channel list from a list of only receivable channels, and then selects one channel from the channels registered in the channel list according to a predetermined condition. Select one channel and register the channel specific information in the channel list.

  In a third aspect based on the second aspect, the channel selection control unit selects one channel by causing the user to select from a list of only receivable channels.

  In a fourth aspect based on the first aspect, the channel selection control unit designates a channel received by the receiving unit, and when the signal of the channel can be received by the receiving unit, the first received receivable Register unique information for each channel in the channel list.

  In a fifth aspect based on the first aspect, the channel selection control unit detects that the signal of the designated channel is receivable using information obtained by the demodulation unit demodulating the multiplexed signal. To do.

  In a sixth aspect based on the first aspect, when the channel selection control unit is selected based on the channel list, the channel selection control unit additionally registers the specific information of the selected channel in the channel list.

  In a seventh aspect based on the sixth aspect, the unique information includes at least reception area information indicating a broadcast area. When the reception area indicated by the specific information to be additionally registered is not the same or adjacent to the reception area indicated by the specific information already registered in the channel list, the channel selection control unit The selected channel is stored in the channel list storage unit as another channel list.

  In an eighth aspect based on the first aspect, when the channel selection control unit cannot receive the signal of the designated channel by the reception unit, the reception status of the reception unit for the channel until a predetermined termination condition is satisfied. Continue checking.

  A ninth invention is a digital broadcast receiving program executed by a computer of a digital broadcast receiving apparatus. The digital broadcast receiving apparatus receives a digital broadcast of a channel selected from the channel list. The channel list is set as a list of receivable channel candidates. The digital broadcast reception program causes a computer to execute a reception step, a registration step, a channel list storage step, and a channel selection step. In the reception step, the frequency to be received is set according to the designated channel. The registration step registers a receivable channel in the channel list when the multiplexed signal of the channel specified in the reception step is receivable. In the channel list storing step, the channel list is stored in a storage unit included in the digital broadcast receiving apparatus. The channel selection step demodulates the multiplexed signal of the channel list created in the list of only receivable channels and stored in the storage unit, or for some channels registered in the channel list in the registration step Channel selection is performed on the basis of a channel list in which unique information separated and extracted from the transport stream is registered and stored in the storage unit.

  A tenth aspect of the invention is a digital broadcast receiving method for receiving a digital broadcast of a channel selected from a channel list. The channel list is set as a list of receivable channel candidates. The digital broadcast receiving method includes a reception step, a registration step, a channel list storage step, and a channel selection step. In the reception step, the frequency to be received is set according to the designated channel. The registration step registers a receivable channel in the channel list when the multiplexed signal of the channel specified in the reception step is receivable. The channel list storing step stores a channel list. The channel selection step is separated from the channel list created with a list of only receivable channels or the transport stream obtained by demodulating the multiplexed signal of some channels registered in the channel list in the registration step. Channel selection is performed based on the channel list in which the unique information extracted in this way is registered.

  According to the first aspect, when creating the channel list, by preferentially creating a channel list in which specific information for a list of channels or a part of the channels that the user can select is registered, Since it is not necessary to extract unique information for all channels described in the channel list, it is possible to greatly reduce the time required to present a receivable channel to the user and select a channel.

  According to the second aspect of the invention, when creating the channel list, the channel list of the first stage that lists only the channels that the user can select is preferentially created, and the registration of the unique information is second. Implement at the stage. By creating the channel list in two stages as described above, it is possible to greatly reduce the time required to select a channel by presenting a receivable channel to the user.

  According to the third aspect, since the unique information is registered for the channel selected by the user, the unique information can be acquired in conjunction with the channel selection operation for the user to view.

  According to the fourth aspect of the invention, since the unique information is also registered for the channel that is initially registered in the channel list, management based on the unique information can be performed from the initial stage of channel list creation. When the unique information includes information indicating the broadcast service area, it is possible to manage the area targeted by the created channel list. For example, even if the power of the digital broadcast receiving apparatus is turned off or the area is moved during the creation of the channel list, the area is registered in the initial stage, so that an operation error can be prevented.

  According to the fifth aspect, since it is determined whether or not reception is possible using information obtained in the demodulation process, it is possible to determine whether or not the designated channel can be received reliably.

  According to the sixth aspect of the invention, in creating the channel list, the unique information obtained by the demultiplexing process in the channel selection operation is additionally registered in the channel list. Therefore, the unique information registered in the channel list depends on the channel selection. It can be enriched.

  According to the seventh aspect, it is possible to prevent unique information acquired in different broadcast areas in the same channel list from being described, and to manage the information as a channel list for each broadcast area.

  According to the eighth aspect, since the reception status is confirmed a plurality of times for the designated channel, it is possible to create a channel list based on the accurate reception status in a short time.

  Further, according to the digital broadcast receiving program and the digital broadcast receiving method of the present invention, the same effects as those of the digital broadcast receiving apparatus described above can be obtained.

(First embodiment)
With reference to FIG. 1, a digital broadcast receiving apparatus according to a first embodiment of the present invention will be described. FIG. 1 is a block diagram showing the configuration of the digital broadcast receiving apparatus. Typically, the digital broadcast receiving apparatus described in the present embodiment is a receiving apparatus mounted on a mobile body such as a portable type or a vehicle that can be moved while viewing the digital broadcast. Further, in the description of the present embodiment, as a digital broadcast received by the digital broadcast receiving apparatus, a portable digital terrestrial television broadcast service (hereinafter referred to as a one-segment broadcast) defined by the Radio Industries Association (ARIB). Will be described as an example. The details of the one-segment broadcasting are described in various materials issued by ARIB, for example, “Technical Materials for Digital Terrestrial Television Broadcasting Operation Regulation ARIB TR-b14”, and detailed description thereof is omitted here.

  In FIG. 1, a digital broadcast receiver 1 includes an antenna 2, a tuner unit 3, a demodulation unit 4, a demultiplexing unit 5, a decoding unit 6, an output unit 7, a channel selection unit 8, a channel list storage unit 9, and a regional information storage unit 10. And an operation unit 11. The tuner unit 3 receives a multiplexed signal of radio waves having a frequency instructed according to an instruction CS output from the channel selection unit 8 via the antenna 2 and outputs the received signal to the demodulation unit 4. The demodulator 4 performs AGC (Automatic Frequency Control) demodulation, OFDM (Orthogonal Frequency Division Multiplex) demodulation, carrier demodulation, Viterbi decoding, and the like on the multiplexed signal output from the tuner unit 3 and outputs a transport stream TS To do. The demultiplexing unit 5 separates and outputs the video / audio stream, NIT (Network Information Table), and SDT (Service Description Table) from the transport stream TS. The decoding unit 6 decodes the video / audio stream and outputs it to the output unit 7. The output unit 7 is, for example, a monitor that displays video and a speaker that reproduces audio, and outputs information from the decoding unit 6 and the channel selection unit 8. The channel selection unit 8 can select a list of channels that can be selected by combining a plurality of channels that can be received in a predetermined region and the broadcast station names of the respective channels in accordance with an instruction signal operated by the user using the operation unit 11. (Hereinafter referred to as a channel list) or create a channel. The channel list storage unit 9 stores the channel list created by the channel selection unit 8. The area information storage unit 10 stores in advance information indicating adjacent relations between areas such as each reception area in digital broadcasting. The operation unit 11 notifies the channel selection unit 8 of signals indicating a channel list display instruction, a channel selection instruction, a channel list creation instruction, and the like in accordance with a user operation.

  The digital broadcast receiving apparatus 1 receives broadcast radio waves from an antenna 2, selects a desired broadcast station by tuning the tuner unit 3 to a predetermined frequency assigned to each broadcast station, and receives a multiplexed signal. Broadcast radio waves are transmitted by the OFDM method, and demodulated into a transport stream TS by the demodulation unit 4 performing AGC, OFDM demodulation, carrier demodulation, Viterbi decoding, and the like. Here, in digital terrestrial television broadcasting, it is possible to divide the frequency band of one channel into 13 segments and change the modulation method for each group of segments. For example, 12 segments are allocated for fixed reception, 1 segment is allocated for a mobile terminal, and 1 segment for the mobile terminal is modulated by the QPSK system that is resistant to movement, thereby enabling television reception while moving. The transport stream TS demodulated by the demodulator 4 is multiplexed with video / audio / data, etc., and the demultiplexer 5 separates the video and audio from the transport stream TS and outputs them to the decoder 6. The PSI / SI is separated and output to the channel selection unit 8. Then, the decoding unit 6 performs decoding of the separated video and audio. The decoded video and audio are presented to the user at the output unit 7. Specifically, the output unit 7 displays video on a monitor such as a liquid crystal display and outputs audio from a built-in or external speaker.

  Further, the demodulator 4 outputs demodulation state information DI obtained from processing such as AGC, OFDM demodulation, carrier demodulation, and Viterbi decoding to the channel selection unit 8. For example, the demodulation state information DI is AGC gain information, information on OFDM frame synchronization establishment of OFDM demodulation, and the like. The channel selection unit 8 can detect the reception state of the channel being received by the tuner unit 3 using the demodulation state information DI. The channel selection unit 8 can obtain information earlier by using the information (for example, AGC gain information) obtained in the preceding stage of the demodulation process as the demodulation state information DI, while the information in the subsequent stage of the demodulation process (for example, establishment of OFDM frame synchronization) The information including the above information) can grasp the reception state of the tuner unit 3 more accurately. Typically, the digital broadcast receiving apparatus 1 has a CPU (Central Processor Unit) and a storage unit, and the CPU executes a digital broadcast reception program stored in the storage unit, whereby a channel list which will be described later. (Particularly, operations of the demodulator 4, the demultiplexer 5, the decoder 6, and the channel selector 8).

  Next, with reference to FIG. 2 to FIG. 5, an operation in which the digital broadcast receiving apparatus 1 creates a channel list will be described. FIG. 2 is a flowchart showing an operation in which the digital broadcast receiving apparatus 1 creates a channel list. FIG. 3 is a subroutine showing the detailed operation of the channel list creation process in step S51 in FIG. 4 and 5 are diagrams for explaining a specific example of the channel list created in the operation shown in FIG.

  In FIG. 2, for example, when the user operates the operation unit 11 and inputs a channel list creation instruction to the digital broadcast receiving apparatus 1, the channel list creation process is started. Note that it is also possible to automatically start creating a channel list upon detecting that the reception state of the digital broadcast in the digital broadcast receiving apparatus 1 has deteriorated below a predetermined threshold.

  When the channel list creation is instructed, the channel selection unit 8 creates a channel list based on the current reception status for all physical channels on which one-segment broadcasting is likely to be broadcast (step S51), and continues the processing. The process proceeds to step S52. Here, for example, in the case of one-segment broadcasting, the physical channel indicates each channel of 13 to 62 channels in the UHF band, and the broadcasting frequency for each physical channel is uniquely set in advance and stored in the tuner unit 3. ing. With reference to FIG. 3, the detailed operation of the channel list creation process in step S51 will be described.

  In FIG. 3, the channel selection unit 8 selects a desired channel from the physical channels, outputs an instruction CS for receiving the channel to the tuner unit 3 (step S61), and advances the processing to the next step. The tuner unit 3 performs reception by matching the frequency to the channel corresponding to the instruction CS. Here, the desired channel is any one of 13 to 62 channels set as physical channels. For example, every time step S61 is repeated, channels are sequentially set between 13 to 62 channels one by one. It will change.

  Next, the channel selection unit 8 checks the demodulation state information DI notified from the demodulation unit 4 and determines whether the physical channel selected in step S61 is a channel that can be received by the tuner unit 3 (step S62). ). When the channel selection unit 8 determines that the channel is a receivable channel, the channel selection unit 8 proceeds to the next step S63. On the other hand, if the channel selection unit 8 determines that the channel cannot be received, the channel selection unit 8 advances the processing to the next step S64. The demodulation state information DI is information related to the AGC gain information and the OFDM frame synchronization establishment of the OFDM demodulation as described above, and the information used for the determination in the step S62 may be information combining them, Either one of the information may be used. For example, if the OFDM frame synchronization is not established in the demodulator 4 even after a predetermined time has elapsed after setting the frequency in the tuner unit 3, the channel selection unit 8 determines that the channel of the frequency is an unreceivable channel. On the other hand, when synchronization is established within a predetermined time, the channel selection unit 8 determines that the channel is a receivable channel.

  In step S63, the channel selection unit 8 describes the physical channel determined to be receivable in the channel list and stores it in the channel list storage unit 9. Next, the channel selection unit 8 determines whether or not the processing of steps S61 to S63 has been performed for all physical channels from 13 to 62 channels. When the unprocessed physical channel remains, the channel selection unit 8 returns to step S61 and repeats the process. On the other hand, if the processing of all physical channels has been completed, the channel selection unit 8 ends the processing by the subroutine.

  Returning to FIG. 2, in step S <b> 52, the channel selection unit 8 uses the output unit 7 to inquire the user whether or not to finish the creation of the channel list. If the channel selection unit 8 does not finish creating the channel list, the channel selection unit 8 proceeds to the next step S53. On the other hand, when the channel selection unit 8 ends the creation of the channel list, the process proceeds to the next step S54. For example, when the user inputs an instruction to end the creation of the channel list by operating the operation unit 11, the channel selection unit 8 determines to end the creation of the channel list. The channel selection unit 8 creates the channel list when an instruction to continue the creation of the channel list is input by the user operating the operation unit 11 or when an instruction from the user is not input within a predetermined time. Judge not to end.

  In step S53, the channel selection unit 8 detects the current reception status for physical channels not registered in the channel list, and describes the physical channels determined to be receivable in the channel list. And the channel selection part 8 returns to said step S52, and repeats a process. That is, step S53 and step S51 perform substantially the same processing, but the difference between them is that the reception status is detected for all physical channels in step S51, whereas the channel in step S53. The point is to detect the reception status for physical channels not registered in the list. For example, when the digital broadcast receiving apparatus 1 is placed in a place with a poor reception environment such as in a tunnel during the process of step S51, a channel list that can be selected in the placed area cannot be created in this step. In order to solve such a problem, it is expected that the reception environment is improved while repeating the process of step S53 until the user inputs an instruction to finish the creation of the channel list. A list of available channels can be created.

  On the other hand, in step S54, the channel selection unit 8 displays the channel list created in step S51 or step S53 on the monitor of the output unit 7, prompts the user to select a channel, and proceeds to the next step. FIG. 4 is a display example of a channel list in which five receivable physical channels are registered. In FIG. 4, numbers in parentheses in the channel column indicate physical channels that can be received. At the time of the processing in step S54, since the PSI / SI information output from the demultiplexing unit 5 has not been received, it is indicated that the broadcast station name and reception area for each physical channel have not been investigated. However, although the channel list is a list in which only physical channels are described, it shows a list of physical channels that can be received in the area where the digital broadcast receiving apparatus 1 is currently arranged. Can be used to select a channel.

  Next, the channel selection unit 8 receives the channel selection designation of the channel desired by the user selected from the channel list displayed on the monitor via the operation unit 11, and instructs to adjust the frequency of the tuner unit 3 for receiving the channel. CS is output (step S55). Then, the channel selection unit 8 acquires channel-specific channel specific information (step S56), describes the channel specific information in the channel list, and stores it in the channel list storage unit 9 (step S57). The process ends.

  Here, when the channel selection unit 8 matches the frequency of the tuner unit 3 in step S55 in response to the channel selection instruction from the operation unit 11, the received broadcast radio wave is demodulated into the transport stream TS by the demodulation unit 4. Then, the demultiplexing unit 5 performs processing for separating the video / audio stream and the PSI / SI from the transport stream TS, and outputs the PSI / SI to the channel selection unit 8. The channel selection unit 8 extracts the specific information necessary for the channel list using the PSI / SI received in step S56, and sets the broadcast station name, reception area, and channel number for the channel specified for channel selection in step S57. Add to the channel list.

  For example, the channel selection unit 8 extracts remote_control_key_id and service_id of the channel being received from the NIT, and extracts the organization channel name from the SDT. Then, the channel selection unit 8 describes the organization channel name as it is in the channel list as the broadcasting station name of the channel designated for channel selection. Further, the channel selection unit 8 converts the 3-digit number determined by ARIB using remote_control_key_id and service_id, and describes the 3-digit number in the channel list as the channel number of the designated channel. Further, the channel selection unit 8 analyzes the information included in the service_id, and describes the analysis result in the channel list as a reception area where the channel designated for channel selection has been received.

  FIG. 5 is an example of a channel list in which unique information of one physical channel (15) is described in the channel list shown in FIG. In FIG. 5, for the physical channel (15) of the channel list, the channel number “611” in the channel column, the broadcast station name “A broadcast” in the broadcast station name column, and the receive area “Kyoto” in the receive area column. Is described. In this way, along with the list of receivable physical channels, at least one specific information indicating the three-digit number of the channel acquired from the PSI / SI in the designated physical channel, the broadcast station name, and the reception area is registered. A channel list is created.

  After creating the channel list based on the flow chat shown in FIG. 2, the user can select a channel by selecting each physical channel described in the channel list. Specifically, when the user inputs a channel up / down instruction via the operation unit 11, the physical channels described in the channel list are sequentially switched, or a desired channel is selected by the user from the displayed list of the channel list. To do. By this channel selection operation, a channel selection instruction is output from the operation unit 11 to the channel selection unit 8. Upon receiving the channel selection instruction, the channel selection unit 8 adjusts the frequency of the tuner unit 3 to a desired physical channel. In response to this channel selection operation, the digital broadcast receiving apparatus 1 performs the same operations as those in steps S55 to S57 described above. In other words, the PSI / SI in the physical channel corresponding to the channel selection operation is acquired, and a channel list is created in which the three-digit number of the channel for the physical channel, the broadcast station name, and unique information indicating the reception area are further registered. The

  FIG. 6 is an example of a channel list in which unique information of two physical channels (27) and (41) is further described in the channel list shown in FIG. In FIG. 6, for the physical channel (27) in the channel list, the channel number “621” in the channel column, the broadcasting station name “B TV” in the broadcasting station name column, and the receiving area “Kyoto” in the receiving area column. Is described. For the physical channel (41) in the channel list, the channel number “661” is displayed in the channel column, the broadcasting station name “C broadcasting” is displayed in the broadcasting station name column, and the receiving area “Osaka” is displayed in the receiving area column. is described. Thus, the registration information described in the channel list gradually increases in accordance with the channel selection operation after the channel list is created.

  Here, when the channel selection unit 8 analyzes the reception area according to the channel selection operation and describes it in the channel list, the two reception areas are the same as or compared to the reception areas for other channels registered in the channel list. Check for adjacency. Note that the channel selection unit 8 determines whether or not two reception areas are adjacent to each other using the area information stored in the area information storage unit 10. For example, in the channel list shown in FIG. 6, “Kyoto” or “Osaka” is described, adjacent relations or the same reception area is registered, and all are included in the Kinki region. When a channel indicating the reception area “Tokyo” is selected by the above channel selection operation for this channel list, the channel selection unit 8 determines that “Tokyo” and “Kyoto” or “Osaka” are not adjacent to each other. to decide. The channel selection unit 8 determines that there is no adjacent relationship between the “Kanto region” including “Tokyo” and the “Kinki region” including “Kyoto” or “Osaka”. Therefore, the channel selection unit 8 receives digital broadcasting in a broadcasting service area different from the area where the channel list shown in FIG. 6 is created, and determines that the channel list is not a channel list that can be selected in the current area. To do. In such a case, the channel selection unit 8 notifies the user via the output unit 7 of a message that prompts the user to recreate the channel list. Alternatively, the channel selection unit 8 manages a channel to be newly added (that is, a physical channel in which the reception area “Tokyo” is found) as a separate channel list independent of the channel list illustrated in FIG. 6. Then, the channel selection unit 8 starts the channel list creation process from step S53 (see FIG. 2) in order to complete the independent channel list.

  As described above, according to the digital broadcast receiving apparatus according to the present embodiment, when the channel list is created, the first-stage channel list that preferentially lists only the physical channels that can be selected by the user is created. Then, registration of the unique information included in the PSI / SI obtained by the demultiplexing process is performed according to the channel selection operation for the physical channel. By creating the channel list in two stages as described above, it is possible to greatly reduce the time required to select a channel by presenting a receivable channel to the user.

  The demodulation state information DI has been described using AGC gain information and information related to the establishment of OFDM frame synchronization for OFDM demodulation. However, the present invention is not limited to these, and does not include PSI / SI information. Other information may be used as long as the information is obtained in the above.

  In addition, the description has been given of extracting the three-digit number, the organization channel name, and the reception area from the NIT and SDT included in the PSI / SI as specific information and registering them in the channel list. However, the present invention is not limited to these. The present invention can obtain the same effect when other information extracted from / SI is described in the channel list.

  Moreover, although the case of 1 segment broadcasting was demonstrated as digital broadcasting which the digital broadcasting receiver 1 receives, it is not limited to this, The present invention can acquire the same effect with respect to digital broadcasting in general. Needless to say.

(Second Embodiment)
A digital broadcast receiving apparatus according to the second embodiment of the present invention will be described. The configuration of the digital broadcast receiving apparatus is the same as that of the digital broadcast receiving apparatus 1 described in the first embodiment with reference to FIG. The detailed explanation is omitted. The overall operation of the digital broadcast receiving apparatus for creating a channel list is the same as the flowchart described in the first embodiment with reference to FIG. 2, and details of the channel list creation process in step S51 in FIG. The only difference is the operation. Hereinafter, with reference to FIG. 7, the detailed operation of the channel list creation processing in step S51 in the second embodiment will be described. FIG. 7 is a subroutine showing the detailed operation of the channel list creation process in step S51 in FIG.

  In FIG. 7, the channel selection unit 8 selects a desired channel from physical channels, outputs an instruction CS for receiving the channel to the tuner unit 3 (step S71), and advances the processing to the next step. The tuner unit 3 performs reception by matching the frequency to the channel corresponding to the instruction CS. Here, the desired channel is any one of 13 to 62 channels set as physical channels. For example, every time step S61 is repeated, channels are sequentially set between 13 to 62 channels one by one. It will change.

  Next, the channel selection unit 8 checks the demodulation state information DI notified from the demodulation unit 4 and determines whether the physical channel selected in step S71 is a channel that can be received by the tuner unit 3 (step S72). ). When the channel selection unit 8 determines that the channel is a receivable channel, the channel selection unit 8 proceeds to the next step S73. On the other hand, if the channel selection unit 8 determines that the channel cannot be received, the channel selection unit 8 proceeds to the next step S77. Since the demodulation state information DI is the same as that of the first embodiment described above, detailed description thereof is omitted.

  In step S73, the channel selection unit 8 describes the physical channel determined to be receivable in the channel list and stores it in the channel list storage unit 9. Then, the channel selection unit 8 determines whether or not unique information is described for at least one physical channel described in the channel list (step S74). Then, if the channel list does not contain unique information, the channel selection unit 8 advances the process to the next step S75. On the other hand, when the unique information is described for at least one channel in the channel list, the channel selection unit 8 advances the processing to the next step S77.

  In step S75, the channel selection unit 8 outputs an instruction CS for adjusting the frequency of the tuner unit 3 for receiving the currently selected physical channel, receives the PSI / SI of the channel from the demultiplexing unit 5, and receives the unique information. To get. Then, the channel selection unit 8 describes the acquired unique information in the channel list and stores it in the channel list storage unit 9 (step S76), and proceeds to the next step S77. By performing the processes of steps S75 and S76, the list of physical channels that can be received and the three-digit number of the channel acquired from the PSI / SI in the selected physical channel, the broadcast station name, and the reception area are shown. A channel list as shown in FIG. 5 in which at least one unique information is automatically described is created. Note that the processes in steps S75 and S76 are the same as the processes in steps S56 and S57 (see FIG. 2), and thus detailed description thereof is omitted.

  In step S77, the channel selection unit 8 determines whether or not the processing in steps S71 to S76 has been performed for all physical channels from channel 13 to channel 62. If the unprocessed physical channel remains, the channel selection unit 8 returns to step S71 and repeats the process. On the other hand, if the processing of all physical channels has been completed, the channel selection unit 8 ends the processing by the subroutine.

  As described above, according to the digital broadcast receiving apparatus according to the present embodiment, when creating the channel list, the physical channels that can be selected by the user are listed, and at least one channel is included in the PSI / SI. A channel list of the first stage describing channel specific information is created preferentially. For other physical channels, registration of unique information obtained from PSI / SI by demultiplexing processing is performed according to the channel selection operation for the physical channel. By creating the channel list in two stages as described above, it is possible to greatly reduce the time required to select a channel by presenting a receivable channel to the user. At the time when the first-stage channel list is created (before the operation of step S54 in FIG. 2), since at least one broadcast service area for which the channel list has already been created is described, the created channel list is the target. Can manage the area. For example, in the operation in the first embodiment, the digital broadcast receiving apparatus 1 is turned off before the channel selection in step S55 in FIG. 2 or the channel selection in step S55 after Yes is selected in step S52. If the area is moved before the designation, the channel list may be separated from the target area, and there is a risk that an operation error may occur due to an unknown broadcast service area to be created. However, in the second embodiment, since the area targeted for creation at the time of creating the first-stage channel list is registered, such an operation error can be prevented.

  In the operation in step S74, the number of channels for which unique information is registered may be one as a determination condition, but a plurality of channels may be used. Conditioning the registration of multiple pieces of unique information reduces the effect of shortening the time required to create the channel list, but a lot of information for managing the broadcast service area where the channel list was created is It can be obtained immediately after creating the channel list.

  The digital broadcast receiving apparatus, the digital broadcast receiving program, and the digital broadcast receiving method according to the present invention can greatly shorten the time until a channel that can be selected in the arranged area can be selected. This is useful in portable devices that can be moved while viewing and devices mounted on moving objects such as vehicles.

The block diagram which shows the structure of the digital broadcast receiver which concerns on the 1st and 2nd embodiment of this invention The flowchart which shows the operation | movement which the digital broadcast receiver 1 of FIG. 1 produces a channel list. Subroutine showing detailed operation of channel list creation processing of step S51 according to the first embodiment of the present invention Specific example of the channel list to be created Specific example of the channel list to be created Specific example of the channel list to be created Subroutine showing detailed operation of channel list creation processing in step S51 according to the second embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiver 2 ... Antenna 3 ... Tuner part 4 ... Demodulation part 5 ... Demultiplexing part 6 ... Decoding part 7 ... Output part 8 ... Channel selection part 9 ... Channel list storage part 10 ... Area information storage part 11 ... Operation part

Claims (10)

A digital broadcast receiving apparatus that receives a digital broadcast of a channel selected from a channel list set as a list of receivable channel candidates,
A receiver for receiving a multiplexed signal having a frequency corresponding to the channel;
A demodulator that demodulates the multiplexed signal received by the receiver into a transport stream;
A demultiplexing unit that separates and extracts unique information included in the transport stream demodulated by the demodulation unit;
A channel selection control unit for registering a receivable channel in the channel list when a signal to be received by the reception unit can be received by the channel specified by the reception unit.
A channel list storage unit for storing the channel list,
The channel selection control unit is based on a channel list created by a list of only receivable channels or a transport stream obtained by demodulating a multiplexed signal of the channel for a part of channels registered in the channel list. A digital broadcast receiving apparatus, wherein channel selection is performed based on a channel list in which unique information extracted by the demultiplexing unit is registered.   The channel selection control unit creates the channel list from a list of only the receivable channels, selects one channel from the channels registered in the channel list according to a predetermined condition, and selects the channel The digital broadcast receiving apparatus according to claim 1, wherein the unique information is registered in a channel list.   The digital broadcast receiving apparatus according to claim 2, wherein the channel selection control unit selects the one channel by causing a user to select from a list of only receivable channels.   The channel selection control unit designates a channel to be received by the reception unit, and when the signal of the channel is receivable by the reception unit, the unique information of the receivable channel extracted first in the channel list. The digital broadcast receiver according to claim 1, wherein the digital broadcast receiver is registered.   The channel selection control unit detects that the signal of the designated channel is receivable using information obtained by the demodulation unit demodulating the multiplexed signal. The digital broadcast receiver as described.   2. The digital broadcasting according to claim 1, wherein the channel selection control unit additionally registers the specific information of the selected channel in the channel list when a channel is selected based on the channel list. Receiver device. The specific information includes at least reception area information indicating a broadcast area,
When the reception area indicated by the specific information to be additionally registered is not the same or adjacent to the reception area indicated by the specific information already registered in the channel list, the channel selection control unit is newly registered 7. The digital broadcast receiving apparatus according to claim 6, wherein the information and the selected channel are stored in the channel list storage unit as another channel list.   The channel selection control unit, when the signal of the designated channel cannot be received by the reception unit, continues to check the reception status of the reception unit for the channel until a predetermined termination condition is satisfied. The digital broadcast receiver according to claim 1. A digital broadcast receiving program that is executed by a computer of a digital broadcast receiving apparatus that receives a digital broadcast of a channel selected from a channel list set as a list of receivable channel candidates,
In the computer,
A receiving step for setting a receiving frequency according to a specified channel;
A registration step of registering a receivable channel in the channel list when a multiplexed signal of the channel specified in the reception step is receivable;
A channel list storage step of storing the channel list in a storage unit of the digital broadcast receiving device;
A transport created by demodulating a multiplexed signal of a channel list created in a list of only receivable channels and stored in the storage unit or a part of channels registered in the channel list in the registration step A digital broadcast receiving program for executing a channel selection step of selecting a channel based on a channel list stored in the storage unit by registering unique information separated and extracted from a stream. A digital broadcast receiving method for receiving a digital broadcast of a channel selected from a channel list set as a list of receivable channel candidates,
A receiving step for setting a receiving frequency according to a specified channel;
A registration step of registering a receivable channel in the channel list when a multiplexed signal of the channel specified in the reception step is receivable;
A channel list storing step for storing the channel list;
A channel list created with a list of only receivable channels, or a part of channels registered in the channel list in the registration step, separated from the demodulated transport stream and extracted from the demodulated transport stream And a channel selection step of performing channel selection based on a channel list in which the unique information is registered.

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